H265 software encode with de-interlaced
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ffmpeg -i A.mkv -vf yadif=1 -c:v libx265 -c:a flac -compression_level 8 -ac 2 B.mkv

Sources:
https://video.stackexchange.com/questions/17396/how-to-deinterlacing-with-ffmpeg
https://ffmpeg.org/ffmpeg-filters.html#yadif-1

Date: September 9th 2022